A theoretical reason is developed to explain why the mouth of a vertically stratified estuary should act as a constraint on the amount of salt water available for mixing in the estuary. Flume experiments designed to test this idea are described. The effect of tides on the control action and application to various estuaries is discussed.
Stommel, Henry, and Harlow G. Farmer. 2021. "Classic Article: Control of salinity in an estuary by a transition." Journal of Marine Research 79, (2). https://elischolar.library.yale.edu/journal_of_marine_research/505